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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac00ffcae8c90478daae177092137cdefa8e82cca9d54fe8e14ad3808ae523e' 
  AND token = 'CJkNLuyeURfd4EzqvGVRrgS8OPG9xvTYp8zp6QVvaZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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