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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43be9e3d91abb410eba22db467bc85bba1b06c7886609c2dc7a2dba00a14d1a8' 
  AND token = 'ZErSiUMA7OUgFXSF7+t1XspMsqQ03kc4UL5s6ea4KHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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