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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8dbaa7e96ded2f60f5e79f13c3071aa6bdbeb5122013983188a9a121090a8a' 
  AND token = '8QOUmTtae6LfZgwkQI792YrKvOIYNXI2S2Mmlciwy0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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