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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661f1327a74c0e48bf475d087496ade1dd54ddf4f1768b69e062cfd7a29811a1' 
  AND token = 'AXLmxJanhjMe/pXHFNJGQu3jWL8i6cVrS63z59RHx2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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