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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10b7f1f364c2bc904e59e38921ca2880fcadc0b64c79c22cf7d707bc8f2eb3e' 
  AND token = 'nW+LBTEZd93xoOBCQj3SaRxvWKGRfaAdhNPlcHcBNbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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