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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f56d1bacc99689c39ffa0fb5dc7496e5f1b6312df4e4c0a85927c9db689ce0' 
  AND token = 'yF9We0LklswpULwFvS9PEcrSmep/F0Qzw8f0ft2bKHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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