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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c96cf0d553026a2f8a543cca2b1af98040a44707b93fa2d061eae45cb3aec25' 
  AND token = 'v0mABg4x4u68edpCCbKTV1yYaZXg1xwE4bWZd6lS1lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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