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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526f6599cb708fde3c91188e5238679709eaea556357589b3d5c2110396b6960' 
  AND token = 'apNF+pgygEON1Sf9kUGJAMlUxykjCGmYo07mGQ09HkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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