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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb0d206fda386f7548e801ae90e2ccbfad01d151e09109e92dee0fcaaf593f8' 
  AND token = '8uP3Tn0Adwm+kcXam+f3vo2CZRxSmwam6SOLTUNUGxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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