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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05da473b35b71fa5c8696db869921511cdfb0b2f44b0ef305231f000f0fec473' 
  AND token = 'bteJN20XNH0eMDLre6jcUU/Lyxry3TUEO8EdSWv4KwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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