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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '488a274669ec1f0be7f2e1777e4837972a766cf575dfb118781f6c58673ecb9c' 
  AND token = 'hlVviJg7MiDUIboObMFFSmNjSYWZFL2JJDRPfT0B1cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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