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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55064a1a4a7dc590952702382244f2128f44a8fd14726dd38ef70af83ba6a743' 
  AND token = 'kXL0G5BDQGK5PhchmdP10gm94DlGC9WBoKdlPNIVXh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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