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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133e0bc3354d127db89e1cec7e507419af8581d557a51dfdf504b55a01d28865' 
  AND token = 'g0pJmNtQP5UMSrq6MxqyR2RDc0v9yOLY/aX/KGaggN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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