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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f367ce704837dfb127c8b86427448698f37135f3f837ef2464171b69c1b42f4' 
  AND token = 'aFmhTaaTxIAEmG1pmh62k0QEPLQquCroy4MusFe/OhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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