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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e95f1f36e35c8d1701a4e98305a412cace4d935433d41d18de28ab3de82f10' 
  AND token = 'taOfEgXRXUD0xoV8knBqWwAm1ruriHtvivVjrboJfiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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