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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150d485a2a8609b0f7c6089caae717f159e4fbdfc91e5eecd9f441fcc479c94d' 
  AND token = 'Zq03+sFHM2BIE7DiPd6cQ5Kx2eZi8hccucLrB6MAjng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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