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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f17383e8003543a659256bab5cb8c4dbf3f3a4482853a5ee395ec94880bcb3' 
  AND token = 'dk2qFIdxUfZEigiunpeyixzwwma4TxEhIhnsGVZypzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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