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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4859840cda5d9f92e5eae92a348457b84881818c44d8312f613ebc03e716d4a' 
  AND token = 'ms5mZkIfer5Gku1sfiqx2AKcvz/AFRLxPt9fywZaB3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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