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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c208298c88f8032e1494955c0366c31d3a74378319a1d19b671ac4f1e9d57e9' 
  AND token = 'o0UFc94C1DHXHm4CaYlIYDc6ebsEGgwJasbDlqTkDz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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