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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155d286aafb452e6e9cc06757a5d90cca2eed311e2d8feaa4062a965f529fe0f' 
  AND token = '8BA2Q15Quhzs0EnR4w9UYjI61YkcgNnj9reRyQw4hHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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