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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20fb6330e4591406707a86e07a849363e901d9ea5b7a649a254b8ebfe870bb0' 
  AND token = 'zCQ68Uzoe25BivmdWwy0172cp5FAaY0CcIoHGQ/LRdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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