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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fdaf6c667f743d564ec991650671cc5c3c4b2a3350203aa79d0bf1ebb2be7f' 
  AND token = 'GbaNhsKFFkvxFdUNIpw9viPbHkRSL6g5LH3wq+iYqvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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