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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6103e2484b6a6859e117f3ae3280f931fe7eeced82f0540d230d68398e3df4' 
  AND token = 'pu8fo36RamwF3F2TwQgXZuhS0a06Ekd7xptb/Ueob3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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