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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab5d735445af09e3937991e0af5da6838ea83d0bc81bd11b315ca70d26a42bb' 
  AND token = 'x7ta+9civmk6tOTJd2pU5GR/66r+0GyblKu9h6kmvmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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