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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c223b0e866e79fdd565839dc699c000b9bd5ed81e2c7c26ba3aaa5683a60d7ce' 
  AND token = 'Rsr9vKy2Wpo1slJVOcOhbTmRFKmmyf5b8IdIN0EOFJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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