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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4c36b9c0c446f79b38a5f7e2bfdaae3a525edfbdca0f96ddcf05deb0208899' 
  AND token = 'AFQb9rv580KXNYzDcsnGSScNiE42Se5Bz2TAQ4BcGuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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