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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5d9b60c11d98061c0afdbb5ee8e51e3d460c42f97942e73a2ce0ca87e64037' 
  AND token = 'BI9Q+rozvtlxKumiepDfHnx2AnqdQ7ps8/bB9G1Qrrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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