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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052c94e59d77d9dffbff19f1ba1a8b0dca73b88484fad7cf4609ad4667eb898d' 
  AND token = 'Q2RsHbBqCO3WY21O8IOUV8X1UeLV+NesqTyhpzrUqDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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