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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1f8d527849836a6f845009c08f3fda92d0334124f61ab2b922af07b49b3eb6' 
  AND token = 'Dzbk8qZy+UeQoIBoG2Zjim3eEIjRUvkVeRecv/AQALE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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