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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbb264095c5422b78c663426814802e68a6223edc9b982efd3e0bd53b6807e2' 
  AND token = 'e8VXuXJ+zTXx/82ghzP1i/UNQDUYS9+65IX6wkuCTmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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