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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd537873e291531c5a933f6260ce1c0b16d2b625f80c856bb6d6d67094cf03699' 
  AND token = 'FZhf/2bjeN1PyQLJ4EePGybNtaAEF3+Y30SW3uYiOAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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