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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e3824e09735afc1d6961331d4437e9f676b54223568329110346efcc9f60ec' 
  AND token = 'HncL3EVHlpDdsAVpCAaL7Z3yXFJwAp2CRctw4+m8MuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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