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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae81a79e9ef93de1d7185f44a97e9010840f621fafc44cc0445437287abc8d63' 
  AND token = 'asyO/j6WybraUHAS2Cktt5A28PzsnsSv0RGpKEeq3rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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