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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d25d69b8731e06ff4f8f8099f24f618a572f83e40bbf4751b27153dcbadf7b' 
  AND token = 'aduABIkFlO8Xq7LhXAdfhJ4qAwULY5iwbija9nOCg1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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