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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3c76cd006518b8410b851c8f2dcc9f400f6034de85e9bf358c665c46286d96' 
  AND token = '8EVoUS1H9gUUG2e1PCO2TZnYECa6B1YR4sUo67mHvJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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