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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5369f745c0adb904c1ec0d13f541024e80041c651e26a7718d0fb37517ca88a4' 
  AND token = 'y26eSfy7LKYoBPbRQyGW2F5SjcKMd6pWBoE5pnDdCGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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