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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed0654dd31190cf2240ceaf303064910b139bab21d9a22c90db7b7406be37e7' 
  AND token = 'bNzlamiyZ01UNZWnM+i4avjX8HgVuXq+eJof4aZPnOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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