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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e87609d95ac70d71c8b881d2b3e89a1c6a7ad41ddc74251c8f9d686011b561c' 
  AND token = 'NADGrDK1Q6Fxiifa2xXNFzBiikHftMqfbQZy+czPGfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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