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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c82ae9011285753899489a6772888739c7ed8053d48701e5b828c48f4cf93ff' 
  AND token = 'BJk/5ZOBdDIXv23tKjRycPx3EZFu9IrUSU1kFk9a7Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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