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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833d4157146e444aea31b329a07b45a4b68951228863b2ae1140b24d7ab3b5ad' 
  AND token = '3rlpbFv+R+bhdT86kHx8GYvLYmaHlHQtX2TiJetwEec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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