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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71468e82316812c233fa04f69b8b37846a25a965e8ae823a73f6e031a391410' 
  AND token = '2A9S9qQcFhxXQwnUMzQeIKUoD0OhsOcwPZNyCwINrs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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