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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcfa5dba228cc0f24a1fa7950c983ec40d5c48e9cdb36572a493f1ded46cc613' 
  AND token = 'WY1fz3jfwfURtQLRj/5Ty8EuemB+9Q0JZLOJAGF3C/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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