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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6bc89d3269af0c959c00865118b1d329846f5140d923064025e44756467f9f' 
  AND token = 'fNzIw9qeqa6iwI7OQcdmuB+ccOsWEqI7NZ/17w3UrB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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