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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789d2c1e50a239b43aa6c1b2ef1ddf73442b157445a10fbdd1eb7800d227820d' 
  AND token = 'olRXWDDrCZaQZBRk5VwJqHt06kFmb7fwp+aG3dhIHkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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