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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee56e2384b7b063c19be99eadacee204a97a130d6089837c2c4b1e8fc07fbc2' 
  AND token = 'UjBfpsENj1VyE+txJ48NY+/asg3diiIa4EjSSw9FUhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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