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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d7ca35f2cc0222d6cdf569b606fcb7539f1b4f4e21c774e4c1fdd4406bd8bd' 
  AND token = 'RzyfnMwgn0NEkZWcVmd89bPH0w7bsN5D/IleI25ijFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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