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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131d695dfa20e1c894d0976b4e343d47946ef2092dce7b1c302a6e26d6975e34' 
  AND token = 'sVKq3ksZit9iH3WAwa9Ty5At24VRZrQ7yKbIUx+OfGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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