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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de3ceeea2ed0d58c4b3d81f60134141fefa15ede3a871a2be9ebae63f8891ae' 
  AND token = 'WpNdC0dkVRcs8+djw/PprXFTKQYPQiaf8l4p0ECN2o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}