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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb33761f9948c8c43ea57078990c0aebe11b323fab5244b97dbb90ac38c24973' 
  AND token = 'VvNvfx1HGqQ6VE47KbIO/8esigWLGwo5iHikXT0ADRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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