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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0501c1fd7c478b71bb1422c36bafc59b2401975b895702753d3700d7b7ae316d' 
  AND token = 'gUuF60KVEqNwh2pAX931MwvAHk2Sm3vIf2/CTi5g9/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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