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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b16457b1bbd4c6a1041469c28fd5cb43c143822ada89e1134f0ddcc3413d5e' 
  AND token = 'ftPbQ2w5j3K9ij7wnHzoFnaVc2I12U0NFEVqWMpNqp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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