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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f756e01e0673360dc12f1c87e6e115567a97af13f16a0af41de0a5b1bcda3f0' 
  AND token = 'sRR8oka5KkqcuZZcNuE+qQB/w1eEE+huLAkW7uGJtUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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