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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be17e8c56439de3eeceaa7f17c4b5575803465a16192abfd2474fe04a34305f3' 
  AND token = 'QIFpFpUU6/rbQuVNRzjq1+SF6eygoGjsvlXeVN1Setk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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