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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3324d37c8b7033c7d8c6679eebd5a2bed913d42c06d01a4220a902d62ef65a33' 
  AND token = '+VTw75c7W644GwnNVL8egnjpS9ikeu568Ae5XyIvGmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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