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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c550a618d818431fedd6896118629a714f6c16a5d3eddc709e0625ea4a036d' 
  AND token = '5PdQNeWkqdeh9BQs/PJplXJCZIwGIqAG5OKFGMm8r9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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