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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193aa486b14c169622eef61e0bcdc5a46019a30a9723f18c09cfd5a9ae19d4e9' 
  AND token = 'uoNgarOtC1e5dw96eorv9NFuikqOU5MwWXvL59hw1Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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